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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A212923 G.f. satisfies: A(x) = x^2 + Series_Reversion(x - x*A(x)).

Table of values

n a(n)
1 1
2 2
3 4
4 19
5 111
6 734
7 5338
8 41839
9 348827
10 3065255
11 28199803
12 270253498
13 2687629926
14 27652068276
15 293627150268
16 3211604669731
17 36124424800797
18 417294625090201
19 4944772338009206
20 60045368928594948
21 746560751627818906
22 9496624640844863631
23 123507266690219103213

List of values

[1, 2, 4, 19, 111, 734, 5338, 41839, 348827, 3065255, 28199803, 270253498, 2687629926, 27652068276, 293627150268, 3211604669731, 36124424800797, 417294625090201, 4944772338009206, 60045368928594948, 746560751627818906, 9496624640844863631, 123507266690219103213]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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